Bottoms drainage valves designed in particular for enamelled containers

Abstract

The invention concerns a bottoms drainage valve, designed in particular for enamelled containers used in the chemical industry which must satisfy stringent requirements in terms of resistance, easy maintenance and operational safety. Said bottoms drainage valve comprises a flange portion consisting of a cylindrical section forming the valve seat head and capable of being inserted into an annular constriction of the container, as well as a shoulder extending transversely to said cylindrical section and enables the flange portion to be connected to said container. The invention is characterized in that said flange portion is conically tapered towards its upper end and in that a cylindrical sealing module whereof the upper part includes an elastically/plastically deformable reinforced annular sealing zone is interposed in the annular constricted zone, between the flange part and the container wall.

1 . Bottom drain valve especially for enameled containers of the chemical industry on which strict requirements are imposed with respect to resistance, cleanability, and functional reliability, with a flange part ( 2 ), consisting of a cylindrical section ( 2   a ), which can be inserted into a ring-shaped necked section ( 1 ) of the container to form the seat of the valve disk, and of a collar ( 2   c ) extending transversely to the cylindrical section, by means of which the flange part ( 2 ) can be connected to the container, wherein the flange part ( 2 ) has a conical taper ( 7 ) at the upper end, and in that a cylindrical sealing module ( 5 ) is inserted in the area of the ring-shaped necked section ( 1 ) between the flange part ( 2 ) and the enameling of the container wall, the upper part of this module being provided with a reinforced, elastically/plastically deformable ring-shaped sealing area ( 5   c ).  
   
   
       2 . Bottom drain valve according to  claim 1 , wherein the reinforcement of the sealing module ( 5 ) is formed by an elastically/plastically deformable, ring-shaped, replaceable sealing element ( 6 ), around which the thin-walled material at the free end is folded.  
   
   
       3 . Bottom drain valve according to  claim 1 , wherein the reinforcement of the sealing module ( 5 ) in the area of the free end is formed by a corrugated terminal section ( 9 ).  
   
   
       4 . Bottom drain valve according to  claim 1 , wherein the sealing module ( 5 ) is made of PTFE.